Home / 21,815.66-30,102-12,861.96

Finding the Fourth Proportional to 21,815.66, 30,102 and 12,861.96

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Solution

The fourth proportional to 21,815.66, 30,102 and 12,861.96 is: 17,747.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,815.66 : 30,102 = 12,861.96 : x
  2. Step 2: Convert to fraction form
    21,815.66/30,102 = 12,861.96/x
  3. Step 3: Cross multiply
    21,815.66x = 30,102 × 12,861.96
  4. Step 4: Simplify right side
    21,815.66x = 387,170,719.92
  5. Step 5: Solve for x
    x = 387,170,719.92/21,815.66
  6. Step 6: Final answer
    x = 17,747.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.